export default{
	//为当前模块开启空间命名
	namespaced: true,
	
	//模块的state数据
	state:()=>({
		//购物车的数组，用来存储购物车中每个商品的信息对象
		//每个商品的信息对象都有6个属性
		//goods_id,goods_name,goods_price,goods_count,goods_small_logo,goods_list
		cart: JSON.parse(uni.getStorageSync('cart')||'[]')
	}),
	
	//模块的mutations方法
	mutations: {
		addToCart(state,goods){
		const findResult  =	state.cart.find(x=>x.goods_id === goods.goods_id)
			
		if(!findResult){
			state.cart.push(goods)
		}else{
			findResult.goods_count++
			}
			
			this.commit('m_cart/saveToStorage')
		}, 
		saveToStorage(state){
			uni.setStorageSync('cart',JSON.stringify(state.cart))
		},
		//更新购物车中商品的勾选状态
		updateGoodsState(state,goods){
		const findResult  =	state.cart.find(x=>x.goods_id===goods.goods_id)
		if(findResult){
			findResult.goods_state = goods.goods_state
			
			this.commit('m_cart/saveToStorage')
			}
		},
		//更新商品的数量
		updateGoodsCount(state,goods){
		const findResult  =	state.cart.find(x=>x.goods_id===goods.goods_id)
		if(findResult){
			findResult.goods_count = goods.goods_count
			
			this.commit('m_cart/saveToStorage')
			}
		},
		
		//根据id删除对应的商品
		removeGoodsById(state,goods_id){
		state.cart = state.cart.filter(x =>x.goods_id !== goods_id)
			
			this.commit('m_cart/saveToStorage')
		},
		
		//更新购物车商品全选或不全选的商品勾选状态
		updateAllGoodsState(state,newState){
			state.cart.forEach(x=>x.goods_state = newState)
			this.commit('m_cart/saveToStorage')
		},
		
	},
	//模块的getters属性
	getters:{
		total(state){
			// let c = 0
			// state.cart.forEach(x => c += x.goods_count)
			// return c
			return state.cart.reduce((total,item)=>total+=item.goods_count,0)
		},
		//购物车已勾选商品的总数量
		checkedCount(state){
				return state.cart.filter(x=>x.goods_state).reduce((total,item)=> total+=item.goods_count,0)
		},
		//已勾选商品的总价格
		checkedGoodsAmount(state){
			return state.cart.filter(x=>x.goods_state).reduce((total,item) => total += item.goods_count*item.goods_price,0).toFixed(2)
		}
		
	},
}